[Mailman-Users] removing incoming messages automatically?

[Soon-Son Kwon]

Hello, I am using mailman 2.0.11 on debian woody.

I configured a list to accept messages from subscribers only
so that unsubscribers' messages can be approved by admin manually.

But these days some spammers started to send too many messages
so deleting those messages takes quite time.

Is there any way to configure mailman delete every messages
from unsubscribers automatically and do not even notify it
to the list admin?

I tried to find some option for that in the admin interface but failed....

Thanks in advance...
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